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McLaughlin’s trailer-mounted combination air/water vacuum excavator provides contractors with the advantages of both systems in one package for potholing utilities. A power pack added to the McLaughlin 500-, 800- and 12,000-gallon units make the combination possible. Powered by an 85-horsepower, turbocharged Kubota diesel engine, the 150 cfm rotary compressor and a 3,000 psi water system enable safe soil removal. Water pressure reduces to 1,500 psi using either a four-jet reduction tool or a wobble nozzle digging tool. The unit’s three-stage filtration system with micro-poly filter eliminates bag houses.